Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Old Walled City of Shibam' has mentioned 'Concrete' in the following places:
Occurrence Sentence Text Source
The social, functional and visual integrity are still valid even though visual and structural integrity are indirectly threatened by new constructions and concrete structures in the surrounding environment.
Authenticity is threatened indirectly by outside disruptions and in certain cases, by the general tendency in Yemen of replacing traditional materials by concrete structures.